SSA/ASS Cues - two or more cues/phrases at the same time aren't displayed

[anonym24]

Issue description

two or more cues/phrases at the same time aren't displayed when such lines are occur in .ssa/.ass file subtitles

but only one cue is displayed during playback

Reproduction steps

load the next subtitles file - test5.ass.zip
play those subtitles with the next video file - https://github.com/Matroska-Org/matroska-test-files/blob/master/test_files/test5.mkv?raw=true
there should be two cues at 4-5 second

1. ...the colossus of Rhodes!
2. ...wake up! buddy! cabs are here, yeah!

but only one cue is displayed with ExoPlayer

...wake up! buddy! cabs are here, yeah!

Version of ExoPlayer being used

2.8.4

Test code to get all cues

             for (int i = 0; i < subtitle.getEventTimeCount(); i++) {
                List<Cue> cues = subtitle.getCues(subtitle.getEventTime(i)+1);
                for (Cue cue : cues) {
                  Log.i(TAG, "getCues -" + cue.text);
                }
              }

Logs

getCues - ...wake up! buddy! cabs are here, yeah!
    getCues - ...wake up! buddy! cabs are here, yeah!
    getCues - No!
    getCues - The colossus of Rhodes
    and it is here just for you Proog.
    getCues - It is there...
    getCues - I'm telling you,
    Emo...

...the colossus of Rhodes! is missing

[anonym24]

test5.ass subtitles file source:

[Script Info]
; Script generated by Aegisub 3.2.2
; http://www.aegisub.org/
Title: Default Aegisub file
ScriptType: v4.00+
WrapStyle: 0
ScaledBorderAndShadow: yes
YCbCr Matrix: TV.601
PlayResX: 1024
PlayResY: 576

[Aegisub Project Garbage]
Audio File: test5.mkv
Video File: test5.mkv
Video AR Mode: 4
Video AR Value: 1.777778
Video Position: 125

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:03.54,0:00:05.29,Default,,0,0,0,,{\frz359.9\pos(483,53)}...the colossus of Rhodes!
Dialogue: 0,0:00:03.50,0:00:05.35,Default,,0,0,0,,{\frz359.9\pos(490,543)}...wake up! buddy! cabs are here, yeah!
Dialogue: 0,0:00:05.75,0:00:06.67,Default,,0,0,0,,No!
Dialogue: 0,0:00:06.71,0:00:12.54,Default,,0,0,0,,The colossus of Rhodes\Nand it is here just for you Proog.
Dialogue: 0,0:00:41.62,0:00:43.54,Default,,0,0,0,,It is there...
Dialogue: 0,0:00:43.58,0:00:46.66,Default,,0,0,0,,I'm telling you,\NEmo...

[ClarkKryptonite]

May I ask how you merge .ass to mediasource. I use the same video and .ass file in the issue, however ,the subtitle doesn't displayed.
here is my code.
`DataSource.Factory factory = createFactory(context);

    MediaSource mediaSource = createRegularMS(factory, localUrl2);
    Format subtitleFormat = Format.createTextSampleFormat(
            null,
            MimeTypes.TEXT_SSA,
            C.SELECTION_FLAG_DEFAULT,
            null);

    MediaSource subtitleSource = new SingleSampleMediaSource
            .Factory(factory)
            .createMediaSource(Uri.parse(localSubUrl2), subtitleFormat, C.TIME_UNSET);

MergingMediaSource mgMediaSource= new MergingMediaSource(mediaSource, subtitleSource)`

[tonihei]

Duplicate of #6320.